The U.S. Department of Agriculture (USDA) is offering up to $100 million in grants to all 50 states, Puerto Rico, and the District of Columbia to support and expand biofuel infrastructure, according to a press release from the USDA.

President Obama's U.S. Environmental Protection Agency reduced the federal required levels of ethanol that must be blended with gasoline, which dealt a blow to a biofuel that's falling out of favor in an era of cheap gasoline.

A bi-partisan group of members of the U.S. House of Representatives have introduced legislation that would end the ethanol mandate, following a similar measure introduced in the U.S. Senate in late February.

The price of diesel has declined to a level not seen since late last July, according to the new weekly roundup of prices from the U.S. Energy Department. It has fallen 0.3 cents in the past week for a U.S. average of $3.838 per gallon.

A U.S. House Science, Space and Technology Subcommittee held a hearing to examine the scientific, technical and consumer impact of gasoline with 15% ethanol (E15). The hearing focused on the potential negative impact of E15 on engines, components and fuel-delivery systems.